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Emacs mode for editing Javascript programs

This JavaScript editing mode supports:

- the full JavaScript language through version 1.7
- support for most Rhino and SpiderMonkey extensions from 1.5 to 1.7
- accurate syntax highlighting using a recursive-descent parser
- syntax-error and strict-mode warning reporting
- "bouncing" line indentation to choose among alternate indentation points
- smart line-wrapping within comments and strings
- code folding:
- show some or all function bodies as {...}
- show some or all block comments as /*...*/
- context-sensitive menu bar and popup menus
- code browsing using the imenu' package
- typing helpers (e.g. inserting matching braces/parens)
- many customization options